Multifunction DAQ

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AC measurement of a synchro

I'm trying to differentially measure the output of a synchro.  My synchro has S1, S2 and S3 legs.  Resistance readings of S1>S3 ( which I'm reading off of) are 1k ohms.   I input a 5 vrms/400hz voltage on R1 to R2.  

1) Does the inductance ( which I don't know) affect my reading at all?

2) Do I need to add resistors ( 47K?) to each leg of my differential input?  

I'm asking because when I look on a scope it appears my DAQ is injecting noise on the other lines of my circuit.  sampling at 4000 khz, 2048 samples,

 

thxs.

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Hello Clint1000,

 

Could you please share more information.

What DAQ do you use?

To what device you have connected and how?

 

Please share schematic if possible.

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